光短距离IM/DD系统Volterra非线性均衡复杂度的降低
Complexity Reduction of Volterra Nonlinear Equalization for Optical Short-Reach IM/DD Systems
摘要：
我们研究的方法，以减少计算复杂度的Volterra非线性均衡器（VNLEs）的短距离光传输系统使用强度调制和直接检测（IM/DD）。在这方面的贡献，我们专注于核的数量的结构减少，即我们定义的规则，以决定哪些条款需要实施，哪些可以被忽略的内核计算之前。这种静态复杂度降低与其他方法（如修剪或L1正则化）不同，其他方法在全Volterra均衡器的自适应之后例如通过阈值化来应用。我们调查的影响90 GBd PAM 6 IM/DD的实验数据中获得的背靠背设置，以及在超过1公里的SSMF传输的情况下，复杂性降低。首先，我们表明，三阶VNLE项对系统的整体性能有显着的影响，并且高数量的系数是必要的最佳性能。之后，我们表明，限制，例如，在同一个内核中参与样本之间的抽头间距，可以导致性能和复杂性之间的改进的权衡相比，一个完整的三阶VNLE。我们展示了一个例子，其中三阶内核的数量减半，没有任何明显的性能下降。
英文摘要：
We investigate approaches to reduce the computational complexity of Volterra nonlinear equalizers (VNLEs) for short-reach optical transmission systems using intensity modulation and direct detection (IM/DD). In this contribution we focus on a structural reduction of the number of kernels, i.e. we define rules to decide which terms need to be implemented and which can be neglected before the kernels are calculated. This static complexity reduction is to be distinguished from other approaches like pruning or L1 regularization, that are applied after the adaptation of the full Volterra equalizer e.g. by thresholding. We investigate the impact of the complexity reduction on 90 GBd PAM6 IM/DD experimental data acquired in a back-to-back setup as well as in case of transmission over 1 km SSMF. First, we show, that the third-order VNLE terms have a significant impact on the overall performance of the system and that a high number of coefficients is necessary for optimal performance. Afterwards, we show that restrictions, for example on the tap spacing among samples participating in the same kernel, can lead to an improved tradeoff between performance and complexity compared to a full third-order VNLE. We show an example, in which the number of third-order kernels is halved without any appreciable performance degradation.
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